Messages in this thread Patch in this message | | | Subject | [PATCH 2/4] x86_64 boot -v2: Add linked list of struct setup_data | From | "Huang, Ying" <> | Date | Fri, 28 Mar 2008 10:49:44 +0800 |
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This patch add a field of 64-bit physical pointer to NULL terminated single linked list of struct setup_data to real-mode kernel header. This is used as a more extensible boot parameters passing mechanism.
Signed-off-by: Huang Ying <ying.huang@intel.com>
--- arch/x86/boot/header.S | 6 +++++- arch/x86/kernel/head64.c | 20 ++++++++++++++++++++ arch/x86/kernel/setup_64.c | 22 ++++++++++++++++++++++ include/asm-x86/bootparam.h | 14 ++++++++++++++ 4 files changed, 61 insertions(+), 1 deletion(-)
--- a/include/asm-x86/bootparam.h +++ b/include/asm-x86/bootparam.h @@ -9,6 +9,17 @@ #include <asm/ist.h> #include <video/edid.h> +/* setup data types */ +#define SETUP_NONE 0 + +/* extensible setup data list node */ +struct setup_data { + u64 next; + u32 type; + u32 len; + u8 data[0]; +}; + struct setup_header { __u8 setup_sects; __u16 root_flags; @@ -46,6 +57,9 @@ struct setup_header { __u32 cmdline_size; __u32 hardware_subarch; __u64 hardware_subarch_data; + __u32 payload_offset; + __u32 payload_length; + __u64 setup_data; } __attribute__((packed)); struct sys_desc_table { --- a/arch/x86/boot/header.S +++ b/arch/x86/boot/header.S @@ -120,7 +120,7 @@ _start: # Part 2 of the header, from the old setup.S .ascii "HdrS" # header signature - .word 0x0208 # header version number (>= 0x0105) + .word 0x0209 # header version number (>= 0x0105) # or else old loadlin-1.5 will fail) .globl realmode_swtch realmode_swtch: .word 0, 0 # default_switch, SETUPSEG @@ -227,6 +227,10 @@ hardware_subarch_data: .quad 0 payload_offset: .long input_data payload_length: .long input_data_end-input_data +setup_data: .quad 0 # 64-bit physical pointer to + # single linked list of + # struct setup_data + # End of setup header ##################################################### .section ".inittext", "ax" --- a/arch/x86/kernel/setup_64.c +++ b/arch/x86/kernel/setup_64.c @@ -265,6 +265,26 @@ void __attribute__((weak)) __init memory machine_specific_memory_setup(); } +static void __init parse_setup_data(void) +{ + struct setup_data *data; + unsigned long pa_data; + + if (boot_params.hdr.version < 0x0209) + return; + pa_data = boot_params.hdr.setup_data; + while (pa_data) { + data = early_ioremap(pa_data, PAGE_SIZE); + switch (data->type) { + default: + break; + } + free_early(pa_data, pa_data+sizeof(*data)+data->len); + pa_data = data->next; + early_iounmap(data, PAGE_SIZE); + } +} + /* * setup_arch - architecture-specific boot-time initializations * @@ -317,6 +337,8 @@ void __init setup_arch(char **cmdline_p) strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); *cmdline_p = command_line; + parse_setup_data(); + parse_early_param(); #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT --- a/arch/x86/kernel/head64.c +++ b/arch/x86/kernel/head64.c @@ -11,6 +11,7 @@ #include <linux/string.h> #include <linux/percpu.h> #include <linux/start_kernel.h> +#include <linux/io.h> #include <asm/processor.h> #include <asm/proto.h> @@ -101,6 +102,24 @@ static void __init reserve_ebda_region(v reserve_early(lowmem, 0x100000, "BIOS reserved"); } +static void __init reserve_setup_data(void) +{ + struct setup_data *data; + unsigned long pa_data; + char buf[32]; + + if (boot_params.hdr.version < 0x0209) + return; + pa_data = boot_params.hdr.setup_data; + while (pa_data) { + data = early_ioremap(pa_data, sizeof(*data)); + sprintf(buf, "setup data %x", data->type); + reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf); + pa_data = data->next; + early_iounmap(data, sizeof(*data)); + } +} + void __init x86_64_start_kernel(char * real_mode_data) { int i; @@ -157,6 +176,7 @@ void __init x86_64_start_kernel(char * r #endif reserve_ebda_region(); + reserve_setup_data(); /* * At this point everything still needed from the boot loader
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